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Quarterly Data - Unaudited (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]                      
Operating Revenues $ 34,025 $ 39,874 $ 36,701 $ 32,541 $ 34,626 $ 39,920 $ 35,277 $ 31,769 $ 143,141 $ 141,592 $ 134,598
Operating Income 6,339 11,424 9,814 5,634 8,331 13,177 9,385 6,527 33,211 37,420 35,520
Net Income $ 7,237 $ 11,476 $ 10,923 $ 6,907 $ 8,307 $ 12,737 $ 9,713 $ 7,668 $ 36,543 $ 38,425 $ 33,888
Basic Earnings per Share $ 0.42 $ 0.65 $ 0.62 $ 0.39 $ 0.47 $ 0.73 $ 0.55 $ 0.44 $ 2.08 $ 2.19 $ 2.02
Diluted Earnings per Share 0.41 0.65 0.62 0.39 0.47 0.72 0.55 0.44 2.07 2.18 2.01
Common Dividend Per Share 0.2900 0.2725 0.2725 0.2725 0.2725 0.2563 0.2563 0.2563 $ 1.108 $ 1.041 $ 0.976
High Common Stock Price 119.37 116.40 88.61 85.92 76.08 69.89 72.41 69.92      
Low Common Stock Price $ 98.12 $ 81.02 $ 77.31 $ 67.09 $ 61.81 $ 59.61 $ 53.70 $ 48.79